Insulator.



P-ATENTED 001?. a, 1907. J. 0-. BARCLAY. INSULATOR. APPLIOATIOI FILIYID JULY, 1907.

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M Atty Tool l whorn it may concern:

JOHN c. BARCLAY, OF NEW YORK, N. Y.

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Specification of Letters Patent.

Patented Oct.' 8, 19 07.

, application filed m 2%,1907. amuse. ss4,999

Beiit known that I, Ions C. BARCLAY, a citizen'of theUhited States, residing at New York, in the cou nty of New York and State of New York, have invented cer-y tain new and useful Improvements in Insulators; and 'I do hereby declare the following to be a full, clear,

, and exact description of the same, such as'will enable;

others skilled in the art to which it appertains to make and use the same. 7 1 My invention relates to improvements in telegraph I insulators, and comprises a novel constructionthereof 'facilitating the detachment of electrical. conductors therefrom,-and constituting a'n impro'vement upon the invention set forth in my application filed May 6th,

Insulators such as those. to which my invention lates consist of an approximately'c'onical body of glass or vitreous material having an internslbore adapted to receives. wooden 0 he pegby which the insulator may be fastened to" armor the like, andhaving on its outer side agroov adapted to receive a'tie'wire I insulator, which is of ordinary construction except as to the spiral groove, above and hereinafter mentioned;

by which-the line is attached to the insulator. In practice, the line wire is not usually, if ,ever, wrapped around the insulato'rjtself, b'ut instead-is led by and close to the irisl'llatona nd a separate short piece of wire, termed a tie wire ",is wrapped'around the.

insulator and its ends wrapped around the line wire, so fastening the .line wire to the insulator.-

- i For various reasons it is necessary from time to time to renew insulators. They are not infrequently broken for.one reason or another, and even not broken the insulation resistance becomes impaired in timein many locations, owing to the formation on the surface of the insulator, of a film of dust orsmokedeposit which reduces materially the insulation're': sistance. The renewal or even the cleaning of insulators is commonly deferred as long'as possible, however, not merely because of the cost of the actual renewals, including the labor and new tie wires re quired, but because in the renewal the line wire is adapted to be more or less nicked or twisted, and therefore isapt to break during cold weather. This last objection' is the more serious because the line conduc--' tor, thus injured, is never as reliable as before, and the damage which may result from its injury. cannot be es-- By the present invention I provide means whereby' the insulatorsrnay be removed and replaced without {1f ,1) ir-=n1:;.lors and save the cost of new tiewires, but,

i r-till greater expense resulting frorn izijury wires.

- I willnow proceed to describe invention with reference to the accompanying drawings in which cer tain forms-of insulators embodying my invention are illustrated. I

drawings: Figure 1 shows a side elevation of a telegraph insulator constructed in accordance with my ,invention, with line wire and tie wire connected thereto; Fig. .2 shows'avertical section of such insulator;

to the line wire due to removal and replacing of the tie.

Fig. 3 is a side elevation of an alternative construction of insulator; and Fig. 4' a plan view of the insulator with the tie wire and line wire connected thereto. According t'o myinvention the insulator is provided not only with the ordinary circular groove to .receive the tie wire, but is alsoprovided with a spiral groove of corresponding size, opening out of said circular -grodve and winding upward aroundthe insulator to a point at which, owing to decreased diameter of the insulator, the tie wire may be slipped on or off readily.- R eferring first to Figs. 1, 2 and 4, 1 designates the 2 designates the line wire, and 3 the tie wire. The insulator is provided as usual with an hiternal screw threaded socket 4 adapted to receive a correspondingly threaded pin 5' by which it is supported, 6

designates the ordinary circular: groove extendingaround the insulator at about midway of the length ,thereof, and 7 designatesaspiral' groove opening out of groove 6 and extending to a point near the top of the insulator such that, because of the reduced diamits diameter at groove 6, the loopof the tie wire may he slipped off or on without difliculty. g

It willbe noted that the: size of the spiral groove 7 is substantially the same as that of the circular groove tie wire may lie as well in groove 7 as in groove 6. It

.eter of the insulator at such point as compared with .6; this being substantially essential in order that'the will also be noted thatthe'direction of the spiral groove 7 is the reverse of that of the internal spiral thread 4 so that the same rotation of the insulator which screws the tie wire down in the groove 7 screws said insulator on to its pin 5, and so that the same rotation ofsaid insulator that screws the tie wire-upward in groove 7 screws the insulatorofi from this pin.

In my. prior application Sr. 'No; 372,167 I showed an insulator substantially like thatfshown herein, eircept that it had not the circular groove 6; the in- T tention being that the tie wire should lie normally in oneturn of the spiral. In practice,'however, it has.

been found that this isnot satisfactory,-and that the 1 circular groove 6 is substantially necessary in order that the tie .wire may lie correctly with reference to .the line wire.

Instead of forming the circular grooige 6 7.iiy contiiruous ribs as shown, I mayiorm them by 'a-series'of projecting lugs 8, as shown in Fig. 3.

In usin my. said insulator, to remove the same it is necessary erely-togive the loop of'the tie wire a slight tilt while rotating' the insulator, -to cause it to v6 to -groove 7,. and further rotation -of thei lator. then'screvgr-the tie .wire up in groove 7 until the ti'e .insy*"belifted; ofr. In replacing theinsulator} feisttris-screwed part-way-on to the.

pin 5,-the.loop of-the-tie wire over the top of the-'insulatorland engaged withthe upperp ortion oi the spiral thread 7, andthen the insulator turned fur.

. ther so as to screw .said tie wire loop downward into groove 6; after which the insulator'rnay be turned as necessary to screw' it tightly "on to its pin, without afiecting'the t'ie wire; s Z

rm aware-that'it hasbeen proposed heretofore to I provide an insulator with a projection aiiove the pinsocket, which projection is provided with an external screw thread designed to receive a tie wire. Suclr 3 construction, however, has the practical very serious objection-that the strain on the wire (necessarily very severe at times) acting on this upward'extension of.

insulator. exerts a considerable leverage with respect to-the pin on which the insulator is mounted, tending to .wear away-the threads of the pin and tomake. the

insulator work 16988; moreover,.as will be readily un-. 'derstood, such an-upward projectio nyis extremely likely to'be -broken ofi. Tb reduce leverage on the pin to the lowest extent and to make the insulator ofo I :compe ct form, view of the material of which such insulator must be made, it is substau-- tiaily necessu-y to have the tie wire hear normally at a' point between the ends of the pin socket, as shown herein.

'- What I claim is:

1. An insulator such as described, comprising a tapering body of vitreous material havlnga screw threaded pinsock'et adnpted to receive asupportin'g-pin. and having, between the ends of such pin-socket and in the exterior surface ot -the insulator, a tie-wire channel'extending' around the-insulator and. a spiral channehppening from such tiewlre channel and extending spirally around the insulator toward the smaller end thereof, and constituting a tie wire-thread. r 4 2. An insulator such as described, coniprisinga tapering body of vitreous material having}: screw threaded pinsocket :idapted to receivepa supporting pin and having;

between the ends of such pin-socket and in the exterior surface 0! the insulator, tiewire channel extending around the insulator and a spinal channel opening" from such tie-wire channel and extending spirally around the insulator toward .thesinaller end thereof and c0nstitut-.

ing a tie-wlre thread, the direction of said tie-wire-thrend and thread 01! the pin-socket being opposite.

3. The co nbinati'on with a line conductor provided with -a fnsteningloop, 0! an insulator consisting oLu tapering body, havingan external channel extending completely around it to receive such loop and.ha-ving i1 spiral thread 

